US 5,476,905 AGranted

Grafted, crosslinked and crosslinkable

AssigneeBASF SE

InventorsHarald Schwager, Thomas Muehlenbernd, Bernd L. Marczinke, Juergen Kerth, Hans-Joachim Mueller

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Abstract

Propylene copolymers grafted with .alpha.,.beta.-ethylenically unsaturated carboxylic acids or derivatives and containing up to 35% by weight of other C.sub.2 - to C.sub.10 -alk-1-enes are obtainable by reacting the monomer to be grafted with a propylene copolymer at from 1 to 500 bar, where, in the absence of a free-radical initiator, from 0.01 to 1.0% by weight, based on the propylene copolymer, of the monomer to be grafted are admixed with the molten propylene copolymer, and the grafting reaction is carried out at from 210.degree. to 350.degree. C. The propylene copolymers according to the invention can be converted into crosslinked or crosslinkable propylene copolymers by admixing organic crosslinking agents.

Claims3

Dependent claims

A process for the preparation of a propylene copolymer grafted with an .alpha.,.beta.-ethylenically unsaturated carboxylic acid or derivative thereof,

wherein the propylene copolymer is (i) a copolymer containing from 40 to 95% of a propylene homopolymer and from 5 to 60% by weight of a random propylene copolymer containing as a comonomer at least one C.sub.2 or C.sub.4 to C.sub.10 -alk-1-ene and wherein said comonomer proportion is not more than 35% by weight based on the total polymer, or (ii) a random polypropylene copolymer containing up to 20% by weight of at least one C.sub.2 or C.sub.4 to C.sub.10 -alk-1-ene comonomer, by reacting the monomer to be grafted with a propylene copolymer at from 1 to 500 bar, which comprises, in the absence of a free-radical initiator, adding from 0.01 to 1.0% by weight, based on the propylene copolymer, of the monomer to be grafted to the molten propylene copolymer, and carrying out the graft reaction at from 210.degree. to 350.degree. C.

Dependencies are inferred from the claim text.